Siftproof bag



ma 24, 1949. F. D. PALMER 2,479,739)

SIFTPROOR BAG Filed Nov. 26, 1945 :s Sheets-Sheet 1 May 24, 1949. F. D. PALMER 2,470,789

Han/51", Palm er May 24, 1949. F. D.. PALMER 2,470,789

SIFTPROOF BAG Filed Nov. 26, 1945 s Sheets-Sheet 3 1 1 2021" ,D. Pafmer diiorizg/s Patented May 24, 1949 SIFTPROOF BAG Frank 1). Palmer,- Chicago, 111., assignor to Frank D. Palmer, Inc., a corporation of Illinois Application November 26, 1945, Serial No. 630,771

This invention relates to packaging and more particularly, to the production of a siftproof package for the packaging of powdered and granulated materials; for example, sugar.

The main objects of the invention are to provide a simple but-effective siftproof package construction chamber easily and economically formed, filled and sealed, and which may be made from very simple, easily formed blanks; to provide a siftp'roof package of the character indicated, which may be easily opened to permit dispensing of the packaged material from the 2 Claims. (Cl. 229-17) package; to provide a dispensing opening a'rrangement which will facilitate such effective reclosing of the package so that the content remaining in the package will be effectively maintained clean and in good condition and, in general, it is the object of the invention to provide an improved siftproof package of the character indicated.

Other objects and advantages of the invention will be understood by reference to the following specification and accompanying drawings (three sheets) wherein there is illustrated a siftproof package embodying a selected form of the invention.

In the drawings, I

Figs. 1 and 2 are plans of inner and ou'tercontainer forming blanks respectively;

Figs. 3 to 8 are perspectives respectively illustrating successive steps in the formation of the package, and

Figs. 9 and 10 are perspectives illustrating successive steps in opening the package for dispensing of its content. e

The package structure herein illustrated is, in effect, composed of two paper bags, one inside of the other, such bags being successively formed, one on top of the other on a mandrel.

A blank I having the plain rectangular form shown in Fig. 1, and free from slits or other cuts, is wrapped around a suitable mandrel 2 (Fig. 3) into the form of a tube, the marginal portion 3 of the blank being overlapped outside of the marginal portion 4 thereof and adhesively united to the latter throughout the mouth of the tube thus formed.

The tube is so formed on the mandrel 2 that I of the mandrel and extending across its width and beyond its sides. Triangular outwardly extending ears 6 and I are also formedincident to the folding of the end portion of the tube over the upper end of the mandrel.

The abutting face portions of the rib forming margin 5 of the tube is preliminarily coated with adhesive or thermo-plastic material, preferably the latter, which is then suitably treated as by heat and pressure in the case of thermo-plastic material to reactivate the same and effect interadhesion of said abutting faces. This sealed rib structure provides a siitproof closure for one end of the tube which ultimately will be the bottom end of the bag or receptacle.

After the end of the tube is sealed as illustrated in Fig. 3, the rib 5 is folded over to flatwise position on the end of the mandrel and onthe triangular ear extensions Ii and! after which said ears are folded to an upwardly extending position as shown inFig. 4. The ears 6 and I when in their upwardly extending position as shown in Fig. 4, are in substantially co-planar relation to the respective opposite sides of the tube I from which they extend.

After the blank I has been formed into the partially completed receptacle condition illustrated in Fig. 4. a blank 8 of the form shown in Fig. 2 is next wrapped around the inner con tainer in a manner substantially like the manner in which the blank I was initially formed into a tube around the mandrel 2. The blank 8 is, however, provided with pairs of slits 9 and I0 in its end portion which extends upwardly beyond the end of the mandrel for a purpose which will presently appear. Such slits, however, terminate at their lower ends somewhat short of the level of upper end of the mandrel or rather the plane of the inner bag end closure on the mandrel substantially as represented in Fig. 5. The marginal portion II of the blank 8 is adhesively united to the marginal portion I2 of the blank for the entire lengths of said margins andthe overlap between the margins II and I2 may be arranged to be located on one side of the vertical center line of the face of the mandrel while the overlap between the margins and 4 of the inner receptacle may be arranged to belocated on the opposite side.

The upwardly extending portion I3 of the outer container is next folded inwardly over the end wall of the inner container as shown in Fig. 6. As there shown, narrow marginal portions such as indicated at II will be turned upwardly at the opposite ends of the flap [3 in inside lapping relation to the upwardly extending ears 6 and I of the inner container. The narrow flange-like portions [4, [4 result from the positioning of the slits 9, 9 and 10, Ill beyond the normal corner fold lines I5 of the outer blank I.

The flap l6 formed at the opposite side of the outer container is next folded inwardly over the flap l3 substantially as illustrated in Fig. '7, narrow flange-like marginal portions I! being thereby incidentally folded upwardly in inside overlapping relation to the respective ears 6 and I and the flanges H.

The fiaps l8 and I9 which remain in upstanding relation from the opposite narrow sides of the receptacles together with the ears 6 and l are next folded down on the flap IS, the fiap I8 being folded first and the flap l9 last so that its free end portion overlaps the free end portion of the flap it as shown in Fig. 8.

The blank 8 which forms the outer receptacle is initially provided with a hole 20 between the slits ID, as shown in Figs. 2 and 5 to 8 inclusive, and with angularly disposed weakened tear lines 2| which may be in the form of a perforated score line or the like.

The hole 20 is so located that an end portion 22 of the ear I will be visible and accessible in said hole. The score lines 2| are so arranged that they substantially coincide with the angularly extending edges of the ear I so that the end portion 22 of the ear may be gripped and pulled upwardly to thereby incidentally tear the fiap I9 along the lines 2| to permit the ear to be unfolded to the free extending position illustrated in Fig. 9. After the ear I is opened to the position shown in .Fig. 9, it may be cut transversely along a guide line, such as indicated I at 23 to thereby open the ear I as illustrated in Fig. 10. The cut off ear 1 will then be capable of being opened to form a dispensing spout leading from one side of the package. The inherent flexibility of the bags permits the spout portion to open up under the pressure of the material being poured out of the package. However, if the bag material happens to be extra still, opening may be effected by squeezing the container so as to cause outward bulging of its narrow wall 2 from which the spout ear extends. Such bulging will usually be accompanied by similar outward bulging of the top wall and corresponding bulging of the ear-forming walls so as to open the ear.

To improve the general appearance of the package, the corner portion 2i of the rib 5 (Fig. 4) is folded downwardly and inwardly on the ear so that a simple ear point will appear in the opening 20 as shown in Figs. 5 to 8 inclusive.

The lines on which the blanks l and 8 are folded in the process of forming the double bag receptacle are indicated in light lines in Figs. 1 and 2, but it should be understood that it is not necessary that these fold lines be creased or otherwise preliminarily formed in the blanks. The inner and outer bags may be made of any suitable grade of flexible kraft or other paper, or of non-fibrous sheeting such as cellophane, Pliofllm, metal foils and other sheeting. When each sealable sheeting such as Pliofilm is employed, the parts to be adhesively united may in effect be welded together by the application of heat and pressure in the required areas and other materials which are not inherently heat sealable may have the various joints sealed together by means of thermo-plastic coatings (which may be applied only to the sealed areas or to the entire surfaces of the blanks) or other adhesive material such as any of the suitable varieties of glue employed for bag or box making purposes. The adhesive employed may advantageously be of a moistureproof variety, especially when the packages are to contain material which should be protected against either the absorption or loss of moisture. v

The interengaging faces of the flaps l3 and I6 of the outer receptacle may be adhesively united to each other and the interengaging face portions of the fiaps l6, l8 and i9 are also preferably adhesively united to each other. Since the receptacle is supported on a rigid mandrel,,

heat and pressure may be applied in any required amount to effect sealing by means of thermoplastic sealing material or by fusion of the interengaging surfaces of heat sealable sheet material.

Similarly, heat and pressure may be applied to insure intimate contact of adhesive bearing surfaces and setting and drying of wet adhesive if employed. Provision is, however, made to prevent adhesive attachment of the ear I to the underlying surface of the flap l6. Such provision may be in the form of omitting any adhesive in the appropriate area of the fiap H5 or by omitting the application of heat and pressure from such an area when sealing the flaps if thermo-plastic adhesion is employed.

To make the opening arrangement more conspicuous, the areas of the flaps I6 and 18 which show through the opening 20 may be suitably colored, the end portion 22 of the ear 1 remaining in the natural color of the material of which the container is formed, or being definitely colored so as to cause it to stand out over the surrounding colored area. The area may, for example, be colored red as indicated by the shading 25.

When the inner and outer containers have one end completed as illustrated in Fig. 8, they are removed as a unit from the mandrel and filled with the desired material. The filling end is then closed by simultaneously sealing the double bag structure in any suitable manner but preferably by steps such as illustrated in Figs. 3 and 4 followed by a further step of folding the ears 6 and l inwardly over the end closure or upwardly on the respective side walls of the package. The ears may be adhesively secured in whichever position they are folded. It is preferable that for filling end sealing purposes, the interengaging faces of the end portions of the two receptacles be adhesively united together and the interengaging inside face portions of the inner container be adhesively united to each other by means of adhesive, thermo-plastic material or the inherent properties of heat sealable sheeting if the container is made therefrom.

The described structure results in an efficient siftproof package for materials of the kind indicated, and it involves the waste of only the material cut out to form the opening 20 which is such a small amount as to be practically negligible. Furthermore, it is not essential that the opening 20 be completely formed as illustrated; it may be indicated by slits of such extent that the surrounded portion of the blank is readily removable by the breakin of a few small bonds. Other changes may be made in the structure without departing from the invention.

I claim:

1. A package comprising inner and outer receptacles, the inner receptacle having a closure embodying an ear having separable plies of material respectively exten lng from a pair of walls of the receptacle and united around the free edges of the ear, the outer receptacle having a closure embodying a plurality of flaps successively folded over and adhesively secured to one another to form an end wall for the package, said ear of the inner receptacle being folded into position between the outermost and an inner end wall flap, said ear having a portion projecting beyond an edge portion of said outermost flap so as to be accessible for direct manual gripping and unfolding to a projecting, spout-forming position, said ear being adapted to have an end portion thereof severed therefrom so as to permit separation of the plies of the ear to form a tubular dispensing spout communicating with the interior of the package.

2. A package comprising inner and outer receptacles, the inner receptacle having a closure embodying an ear having separable plies of material respectively extending from a pair of walls of the receptacle and united around the free edges of the ear, the outer receptacle having a closure embodying a plurality of flaps successively folded over and adhesively secured to one another to form an end wall for the package, said ear of the inner receptacle being folded into position overlying said end wall under and entirely within the package.

perimeter of one of said flaps, the latter being provided with an opening spaced inwardly from the edges of said flap and affording access to a free edge portion of said .ear to permit direct gripping and unfolding thereof, and as an incident thereto, unfolding of the overlying flap portion, to a projecting spout-forming-position, said ear being adapted to have an end portion thereof severed-therefrom so as to permit separation oi the plies of the ear to form a tubular dispensing spout communicating with the interior of the FRANK D. PALMER.

REFERENCES orrED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,029,783 Appel June 18, 1912 1,247,237 Doble Nov. 20, 1917 1,959,231 Dube May 15, 1934 2,337,730 Berch Dec. 28, 1943 2,339,156 Davis Jan. 11, 1944 2,361,876 Schell Oct. 31. 1944 

